Can you assist me to construct a 90 confidence interval for
A random sample of 79 light bulbs had a mean life of xbar = 400 hours. Suppose the population standard deviation is 28 hours. Can you assist me to construct a 90% confidence interval for the mean life, and the mu of all light bulbs of this type?
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a random sample of 79 light bulbs had a mean life of xbar 400 hours suppose the population standard deviation is 28
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